S-91500A312 5-40 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Enhanced durability and longevity from passivated finish, reducing wear and preventing galling
• Reliable fastening performance with 70,000 psi tensile strength and Rockwell B80 hardness for high-stress applications
• Quick and efficient installation using standard No. 2 Phillips drive, minimizing tool slippage and assembly time
• Secure flush mounting with 82° countersink angle and flat head design, preventing snagging and improving aesthetics
• Consistent thread engagement through Class 2A thread fit and coarse UNC threading, ensuring vibration resistance
• Full-length threading for maximum grip across the entire 1/2" length, providing uniform clamping force

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 5-40 UNC flat head Phillips screws in 316 stainless steel deliver exceptional performance where corrosion resistance and mechanical integrity are critical. The passivated finish enhances surface durability, reducing friction and preventing seizing in high-temperature or moist environments. With coarse thread spacing and Class 2A thread fit, they provide reliable fastening in metals, plastics, and assemblies subject to vibration, minimizing loosening risks. The 82° countersink angle ensures a flush fit in predrilled holes, making them ideal for machinery, marine equipment, and chemical processing applications where smooth surfaces and regulatory compliance are mandatory.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit per UNC standards with coarse thread spacing and right-hand threading. Manufactured in compliance with ASME B18.6.3 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.